January 1, 2026

William Blair Investment Management: Who We Are

At William Blair Investment Management, our broad-based private partnership structure contributes to our investment professionals’ long tenures and allows for active, long-term decision-making focused on better client outcomes.

100%
Active-employee owned

This and all subsequent data is as of December 31, 2025.

335
Employees

47
Partners

30
Countries in which we have clients

9.8 years
Average client tenure

Entrepreneurial, investment-led, and client-focused culture

Long-term expertise across asset classes globally

Demonstrated track record of value-added performance

We are passionate about the profession of investment management. Our investment teams are solely focused on active management and employ disciplined, analytical research processes across a wide range of strategies, including U.S. equity, non-U.S. equity, and emerging markets debt.

$72.3B¹
Total assets under management

31%
of our AUM is from clients with multiple strategies

31
Portfolio managers

54
Dedicated Investment Management analysts

26 years
Average industry experience for portfolio managers

90%
Portfolio managers and analysts who have earned advanced degrees or are CFA charterholders

We are committed to building client relationships that last year after year rather than quarter to quarter.

We serve consultants, foundations and endowments, public funds, corporations, Taft-Hartley plans, financial institutions, and financial advisors.

Why we invest shapes how we invest—and we are continuously evolving the business and our investment processes to meet clients’ needs while remaining true to our core investment tenets.

¹ Total assets and total strategy assets are inclusive of total discretionary assets under management (AUM) as well as non-discretionary assets under advisement (AUA), as indicated. AUA generally consists of non-discretionary advisory assets managed by third parties in accordance with investment model portfolios provided by William Blair Investment Management, LLC (William Blair). William Blair receives an asset-based fee on AUA but does not exercise investment discretion or trading authority over such assets. All AUA data is reported on a one-month lag.

William Blair’s measure of AUM/AUA for these purposes may differ from the calculations employed by other investment managers and, as a result, may not be directly comparable. This measure also differs from the manner in which William Blair is required to report assets under management in certain regulatory filings.

Filmed January 2026

The views and opinions expressed herein are those of the speaker(s) as of the date of publication, are subject to change without notice as economic and market conditions dictate, and may not reflect the views and opinions of other investment teams within William Blair. Factual information has been obtained from sources we believe to be reliable, but its accuracy, completeness, or interpretation cannot be guaranteed. This material may include estimates, outlooks, projections, and other forward-looking statements. Due to a variety of factors, actual events may differ significantly from those presented. This video has been provided for informational purposes only and should not be considered as investment advice or a recommendation of any particular strategy or investment product, or as an offer to buy or sell any securities or related financial instruments in any jurisdiction. Investment advice and recommendations can be provided only after careful consideration of an investor’s objectives, guidelines, and restrictions. Investing involves risks, including the possible loss of principal. Past performance is not indicative of future results.

Topics: Culture

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Any investment or strategy mentioned herein may not be appropriate for every investor. There can be no assurance that investment objectives will be met. Products and services listed are available only to residents of this jurisdiction and may only be available to certain categories of investors. The information on this website does not constitute an offer for products or services, or a solicitation of an offer to any persons outside of this jurisdiction who are prohibited from receiving such information under applicable laws and regulations. Nothing on this webpage should be construed as advice and is therefore not a recommendation to buy or sell shares.

Please carefully consider the William Blair Funds’ investment objectives, risks, charges, and expenses before investing. This and other information is contained in the Funds’ prospectus and summary prospectus, which you may obtain by calling 1-800-742-7272. Read the prospectus and summary prospectus carefully before investing. Investing includes the risk of loss.

The William Blair Funds are distributed by William Blair & Company, L.L.C., member FINRA/SIPC.

The William Blair SICAV is a Luxembourg investment company with variable capital registered with the Commission de Surveillance du Secteur Financier (“CSSF”) which qualifies as an undertaking for collective investment in transferable securities (“UCITS”). The Management Company of the SICAV has appointed William Blair Investment Management, LLC as the investment manager for the fund.

Please carefully consider the investment objectives, risks, charges, and expenses of the William Blair SICAV. This and other important information is contained in the prospectus and Key Investor Information Document (KIID). Read these documents carefully before investing. The information contained on this website is not a substitute for those documents or for professional external advice.

Information and opinions expressed are those of the authors and may not reflect the opinions of other investment teams within William Blair Investment Management, LLC, or affiliates. Factual information has been taken from sources we believe to be reliable, but its accuracy, completeness or interpretation cannot be guaranteed. Information is current as of the date appearing in this material only and subject to change without notice. Statements concerning financial market trends are based on current market conditions, which will fluctuate. This material may include estimates, outlooks, projections, and other forward-looking statements. Due to a variety of factors, actual events may differ significantly from those presented.

Investing involves risks, including the possible loss of principal. Equity securities may decline in value due to both real and perceived general market, economic, and industry conditions. The securities of smaller companies may be more volatile and less liquid than securities of larger companies. Investing in foreign denominated and/or domiciled securities may involve heightened risk due to currency fluctuations, and economic and political risks. These risks may be enhanced in emerging markets and frontier markets. Investing in the bond market is subject to certain risks including market, interest rate, issuer, credit, and inflation risk. High-yield, lower-rated, securities involve greater risk than higher-rated securities. Different investment styles may shift in and out of favor depending on market conditions. Diversification does not ensure against loss.

Past performance is not indicative of future returns. References to specific companies are for illustrative purposes only and should not be construed as investment advice or a recommendation to buy or sell any security.

William Blair Investment Management, LLC is an investment adviser registered with the U.S. Securities and Exchange Commission.

Issued in the United Kingdom by William Blair International, Ltd., authorized and regulated by the Financial Conduct Authority (FCA), and is only directed at and is only made available to persons falling within articles 19, 38, 47, and 49 of the Financial Services and Markets Act of 2000 (Financial Promotion) Order 2005 (all such persons being referred to as "relevant persons").

Issued in the European Economic Area (EEA) by William Blair B.V., authorized and supervised by the Dutch Authority for the Financial Markets (AFM) under license number 14006134 and also supervised by the Dutch Central Bank (DNB), registered at the Dutch Chamber of Commerce under number 82375682 and has its statutory seat in Amsterdam, the Netherlands. This material is only intended for eligible counterparties and professional clients.

Issued in Switzerland by William Blair Investment Services (Zurich) GmbH, Talstrasse 65, 8001 Zurich, Switzerland ("WBIS"). WBIS is engaged in the offering of collective investment schemes and renders further, non-regulated services in the financial sector. WBIS is affiliated with FINOS Finanzomubdsstelle Schweiz, a recognized ombudsman office where clients may initiate mediation proceedings pursuant to articles 74 et seq. of the Swiss Financial Services Act ("FinSA"). The client advisers of WBIS are registered with regservices.ch by BX Swiss AG, a client adviser registration body authorized by the Swiss Financial Market Supervisory Authority ("FINMA"). WBIS is not supervised by FINMA or any other supervisory authority or self-regulatory organization. This material is only intended for institutional and professional clients pursuant to article 4(3) to (5) FinSA.

Issued in Australia by William Blair Investment Management, LLC (“William Blair”), which is exempt from the requirement to hold an Australian financial services license under Australia's Corporations Act 2001 (Cth). William Blair is registered as an investment advisor with the U.S. Securities and Exchange Commission (“SEC”) and regulated by the SEC under the U.S. Investment Advisers Act of 1940, which differs from Australian laws. This material is intended only for wholesale clients.

Issued in Singapore by William Blair International (Singapore) Pte. Ltd. (Registration Number 201943312R), which is regulated by the Monetary Authority of Singapore under a Capital Markets Services License to conduct fund management activities. This material is intended only for institutional investors and may not be distributed to retail investors.

Issued in Canada by William Blair Investment Management, LLC, which relies on the international adviser exemption, pursuant to section 8.26 of National Instrument 31-103 in Canada.

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William Blair Investment Management: Who We Are

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